Q How can I counter airborne allergens?

A llergies reflect immune-system activity against harmless substances mistakenly identified as threats to the body. Common allergens include pollen, dust, pet dander and mould. Symptoms of seasonal allergy – also called hay fever or seasonal rhinitis – include a runny nose, sneezing, itchy eyes and dark circles under the eyes. The goal of treatment is to convince the immune system that it need not respond to allergens in this way.